@loumay I have exactly a 4 year age gap. I’ve really liked it so far. Age 3 was rough for us so I’m glad to not have had a newborn to deal with as well. Age 4 has been a huge change in my kid’s demeanour, independence, maturity, ability to self regulate etc.
So with that, the thing I have both liked and disliked (but mostly liked) is that the older and younger kids needs are very different. This helps in a few ways. There’s no jealousy or sibling rivalry. The older one was no longer the “baby” a while ago, so he didn’t feel like his position in the family was being superseded. He loves being the big boy who can help teach the baby all the things. He is even old enough to watch over the baby for brief periods if I need to grab something from the other room or go to the bathroom, and he’ll make sure baby isn’t putting anything dangerous in his mouth or going where he shouldn’t, etc. They also play wonderfully together. Older kid is totally independent with toileting, dressing, sleeping, playing, and more. He is at preschool during the week so I have that lovely one on one time with the baby that I got to have with him.
The downside of their needs being different is that it’s harder to double up on things. Different books, different bedtime, different foods, separate baths, etc. So we have to do everything twice. However, now that their ages are 1 and 5 that has started to really change. They can bathe together and mostly eat the same foods. The older one sometimes doesn’t understand why the rules have to be different- like why baby doesn’t have to go to bed when he does, or why baby gets bottles of milk while he has to wait for mealtimes, or baby gets different options of foods while he’s supposed to eat what he’s been given.
Huge pro: They entertain each other for ages!! They adore each other.
Neutral point: when you, the parents, get your relative freedom back. With the 4 year age gap it’s going to be longer before we get time to ourselves again, or can easily travel etc. However, we got a bonus year in between kids- when older was 3, when we travelled to many countries and did lots of fun stuff. So it’s a question of back to back but finishing earlier, or having a bit of a breather in between but then taking longer on the other end.